Effect of progressively increasing lithium conditioning on edge transport and stability in high triangularity NSTX H-modes

Maingi, R.; Canik, J. M.; Bell, R. E.; Boyle, D. P.; Diallo, A.; Kaita, R.; Kaye, S. M.; LeBlanc, B. P.; Sabbagh, S. A.; Scotti, F.; Soukhanovskii, V. A.

doi:10.1016/j.fusengdes.2016.06.058

Title: Effect of progressively increasing lithium conditioning on edge transport and stability in high triangularity NSTX H-modes

Journal Article · 19 July 2016 · Fusion Engineering and Design

DOI: https://doi.org/10.1016/j.fusengdes.2016.06.058 · OSTI ID:1358036

Maingi, R. ^[1]; Canik, J. M. ^[2]; Bell, R. E. ^[1]; Boyle, D. P. ^[3]; Diallo, A. ^[1]; Kaita, R. ^[1]; Kaye, S. M. ^[1]; LeBlanc, B. P. ^[1]; Sabbagh, S. A. ^[4]; Scotti, F. ^[5]; Soukhanovskii, V. A. ^[5]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Princeton Univ., NJ (United States)
Columbia Univ., New York, NY (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

A sequence of H-mode discharges with increasing levels of pre-discharge lithium evaporation (‘dose’) was conducted in high triangularity and elongation boundary shape in NSTX. Energy confinement increased, and recycling decreased with increasing lithium dose, similar to a previous lithium dose scan in medium triangularity and elongation plasmas. Data-constrained SOLPS interpretive modeling quantified the edge transport change: the electron particle diffusivity decreased by 10-30x. The electron thermal diffusivity decreased by 4x just inside the top of the pedestal, but increased by up to 5x very near the separatrix. These results provide a baseline expectation for lithium benefits in NSTX-U, which is optimized for a boundary shape similar to the one in this experiment.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC02-09CH11466; AC05-00OR22725; FC02-04ER54698; FC02-99ER54512; AC52-07NA27344

OSTI ID:: 1358036

Alternate ID(s):: OSTI ID: 1771440

Report Number(s):: PPPL-5278; LLNL-JRNL-820480; PII: S0920379616304550

Journal Information:: Fusion Engineering and Design, Vol. 117; ISSN 0920-3796

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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